Device for sharpening chalk disks.



A. J. GWIEK.

DEVICE FOR SHARPENING CHALK DISKS.

APPLIOATION FILED MAY 18, 1914.

Patented Jan. 26, 1915.

THE NORRIS PETERS Ca. F'HOTO-LITHO.. WASHINGTON. D. C

ANTHONY J'. CWIEK, OF PROVIDENCE, RHODE ISLAND.

DEVICE FOR SHARPENING CHALK DISKS.

Specification of Letters Patent.

Patented Jan. 26, 1915.

. Application filed May 18, 1914. Serial No. 839,312.

To all whom it may concern Be it known that I, ANTHONY J. GWIEK, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Devices for Sharpening Chalk Disks, of which the following is a specification.

This invention relates to certain new and useful improvements in devices for sharpening chalk disks, and pertains more particularly to the sharpening of tailors chalk.

The primary object of the invention is to provide a sharpening device which has means incorporated therein whereby disks of varying diameters may be easily and quickly sharpened.

Further, the invention aims to provide an improved and simplified structure which can be easily operated, and will perform the sharpening action quickly.

The invention consists further in the details of construction and combination of parts more fully hereinafter described and set forth in the appended claims.

In the drawings-Figure 1 is a side elevation of the invention. Fig. 2 is a top plan view. Fig. 3 is a section taken on the line 2%3 of 2, and Fig. a is a detail perspective view of the sharpening blade.

The invention consists of a base member or plate 1, preferably having its ends turned downwardly at- 2 and provided with U- shaped plates 3 which provide sockets for the reception of standards a which latter may be secured to a table or any suitable support.

Mounted on the base 1 is U-shaped hearing or bracket 5 which bracket is secured to the base inspaced relation to one side there of as depicted in Fig. 3 of the drawings. A shaft 6 is journaled in the upper free end portions of the arms of the U-shaped bracket and has an operating crank 7 aflixed to one end thereof, the crank extending beyond the other side of base 1, so as to enable same to freely rotate without interference with the base. The shaft 6 is provided at its opposite end with a reduced threaded shank 8 upon which is mounted a collar 9, having a sleeve 10 projecting outwardly therefrom, a washer 11 being placed on the shank 8 between the collar 9 and the adjacent arm of the bearing 5. The sleeve 10 is of such di ameter as to receive the central perforation of a disk of chalk C, so that the disk of chalk may be engaged with the collar 9, a

washer 13 being also mounted on the shank 8 and engaged with the outer side face of the chalk G, the parts being rigidly connected to the shaft by a wing or thumb nut 12, which is threaded onto shank The cutting blade lei consists of a flexible strip of spring metal secured at 15 to base 1, and having its opposite end free so as to be capable of movement toward and away from the base. The free end of the blade 1% is curved upwardly at 16, so as to extend toward the shaft 6, which latter it directly underlies, or alines with in the same vertical plane. The curved end 16 is bifurcated at 17 to provide a pair of cutting edges which are arranged in the form of a V, so as to bevel the periphery of the chalk disk as shown in Figs. 2 and 3 of the drawings.

The blade 14; is provided with an elongated slot 18 into which projects a stud 20 formed by reducing the upper end of a thumb screw 19, which latter is threaded through the base 1 from below the latter so that by turning of the screw 19 the blade 14 will be raised or lowered, as desired to not only force the cutting edges of the blade into engagement with the chalk, but to also enable the blade to cut chalk possessed of varying diameters.

In operation, the chalk is placed on the shaft 6 and clamped thereon, whereupon the screw 19 is rotated to bring the cutting edges of the blade lat into engagement with the chalk, the crank being then turned to effect cutting of the chalk, and the screw 19 is gradually rotated to bring the cutting edges of the blade into engagement with the chalk so as to gradually cut the same to a point at its greatest diameter.

lVhat I claim as my invention and desire to secure by Letters Patent, is

1. In a chalk sharpener, a base, means borne by the base to rotate the chalk, a blade having one end connected to the base and having its other end movable toward and away from the base and provided with an upwardly extending end which has a V- shaped slot, said blade having an elongated slot between its ends, and a screw projected through the base from below and having a stud which extends upwardly therefrom to slidably engage said elongated slot.

2. In a chalk sharpener, means to rotate 1 the chalk, a blade which has a free end having cutting edges rigidly secured at one end,

chalk, and means for flexing the blade so as the free end of the blade alining with the Copies of this patent may he obtained for five cents each, by addressing the chalk rotating means thereon, a blade on the base afliXed at one end to the base and having its other end freely movable away from the base, said blade having a slot adjacent its free end, and a screw projected through the base and having a stud on its upper end which engages in said slot.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ANTHONY J. CWIEK.

Witnesses ADA E. HAGERTY, J. A. MILLER.

Commissioner of Patents,

Washington, I). G. 

